What is a faucet aerator?

A faucet aerator mixes air and water for a smooth flow. The aerator is located where the water comes out of the faucet. Aerators are a simple and inexpensive way to save water. 

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1. How can I check to see if I have a leak in my home?
2. How much water will I save if I change out my old toilet for a new high efficiency toilet?
3. What is a faucet aerator?